Upgraded from power puck to quad adreneline,disconnected batts as instructed for install.Now truck will not start,wait to start light does not come,cant hear lift pump run codes p0123,p1694,even after disconnecting quad and back to stock.only bad connection found after quad was installed was at the wire tap at pump disconnected batts ,fixed connection crank but no start.Any help would be greatly appreciated. stock truck otherwise.

 

P0123-APP SENSOR SIGNAL VOLTAGE TOO HIGH. Did you plug App sensor back in? Plug injection pump back in? Did you unplug any relays? Check fuse #3 in PDC might be blown

 

I reset apps still nothing,i will try the other suggestions you mentioned,and let you know what happens,thanks for your help.

 

all fuses are good,checked lift pump relay and is ok,pump connection is good,apps plug also ok,if you know of anything else i should check please let me know,thank you.

 

Did you inspect the #13 fuse in the interior fuse panel (on the drivers side of the dash).

 

no but will check right now, brb

 

it is good also.thanks

 

bigiron70,do you think that pcm may have gone?

 

Did you unplug any sensors? possible crank sensor maybe? Wire on injection pump is'nt broken? Do you have scanner to check for crank signal? ECM connector is tight on the module left side of engine block? Do you have alarm system on truck? Is your ignition key black or gray?

 

You could unplug the PCM and try to start truck. Truck will run with it disconnected. Just do not unplug or plug back in with ignition key on or truck running. Without a scanner it would be difficult to diag if ECM or PCM is bad. You can check power and grounds to them but you don't know if they are communicating. There is a test box which you can hook up to injection pump to see if engine will start. It eliminates the ECM and will just verify if injection pump is OK. If you have a DVOM I can give you wiring and test locations for power and grounds if you want to check it out further.

 

only sensor disconected was map,but is plugged back to stock lead.did not mess with crank sensor,and wire is not broken to pump,have no alarm,and key is black.i have a scanner but has showed no codes.i do have a dvom and would like to know where and what to test,thank you.

 

Diag for codes, checking for wiring diag